Yanmar 6LY3 series Operation Manual page 73

Before pressing the start switch again,
confirm that the engine has stopped
completely. If the starter motor is operated
before the engine has completely stopped,
the starter motor pinion gear will be
damaged.
Note: Hold the start switch for a
maximum of 15 seconds in the
START position. If the engine
does not start the first time,
press the rocker switch OFF and
wait for about 15 seconds before
trying again. After the engine
has started, do not press the
rocker switch off. (It should
remain ON.)
CAUTION
• If the vessel is equipped with a
water lift (water lock) muffler,
excessive cranking could
cause seawater to enter the
cylinders and damage the
engine. If the engine does not
start after cranking 15
seconds, close the thru-hull
water intake valve to avoid
filling the muffler with water.
Crank for 15 seconds or until
the engine starts. When the
engine does start, stop the
engine immediately and press
the switch to the OFF position.
• Be sure to re-open the seacock
and restart the engine. Operate
the engine normally.
After the engine has started, check the
following items at a low engine speed:
1. Check that the indicators on the display
and the control head are normal.
2. Check for water or oil leakage from the
engine.
6LY3 Operation Manual
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3. Check that exhaust color, engine
vibrations, and sound are normal.
4. When there are no problems, keep the
engine at low speed to send engine oil
to all parts of the engine.
5. Check that sufficient seawater is
discharged from the seawater outlet
pipe. Operation with inadequate
seawater discharge will damage the
impeller of the seawater pump. If
seawater discharge is too small, stop
the engine immediately. Identify the
cause and repair.
• Is the seacock open?
• Is the inlet of the seacock on the hull
• Is the seawater suction hose broken,
Note: The engine will seize if it is
0000151en
ENGINE OPERATION
bottom clogged?
or does the hose suck in air due to a
loose joint?
operated when seawater
discharge is too small or if load
is applied without any warming
up operation.
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